Firefighter Jose Ortiz describes how he and other Bravest rushed to stop the savage attack. Photo: Gabrielle Bass

Two heroic city firefighters pounced on a meat-cleaver-wielding maniac this morning as he hacked his terrified wife, authorities said.

The bloody domestic attack occurred outside Fong’s Trading at 74 Canal St. in Chinatown — and was captured on chilling security video.

Firefighters Jose Ortiz and James Trainor, who work across the street at Engine Company 9, Ladder Company 6, said they first heard the couple screaming at each other and tussling around 10:24 a.m.

“While we were working on the riggs getting ready for our day tour, I saw a man dragging a woman who was crying and screaming down the street,” said the 51-year-old Ortiz, an 18-year FDNY veteran.

“Once I got closer, the man starts hacking at the woman. He hits her six, eight, maybe 10 times. So, we [he and Trainor] bum-rush him and get him against the fence.”

Another shot of the near-fatal scene (Gregory P. Mango)

The graphic video appears to show the 28-year-old husband, who cops identified as Ming Guang Huang, repeatedly striking his 24-year-old wife with the cleaver and her struggling to get away as the firefighters rush over to save her.

Huang has been charged with attempted murder, felony assault, criminal possession of a weapon and harassment, cops said.

As Ortiz and Trainor reach the woman, who police identified as Jinyia You, her attacker tosses her aside like a rag doll.

The two firefighters then jump on the perp and hold him until cops arrive. He’s cuffed on the ground, with the cleaver lying next to him.

Ortiz recalled crying out, “Help the lady!” as he and Trainor disarmed the suspect.

But the woman was already running down the street, leaving her thick, wedge shoes — and clumps of bloody hair — behind.

That’s when a third firefighter, Shane Clarke, jumped into action.

“I went inside the [fire] house and grabbed a trauma bag” and chased her, Clarke said.

“She was afraid … She has a cut on her head and several wounds on her abdomen. She had six to eight cuts, one deep one on the back of her head. That was the one we were most concerned about.”

Clarke and two neighborhood cops on patrol finally caught up with her at Division and Eldridge streets, witnesses said.

They calmed her down, administered first aid and called paramedics, according to witnesses.

The woman was listed in critical condition last night at Bellevue Hospital but is expected to survive, officials said.

She suffered several serious defensive wounds on her arms, according to law-enforcement sources.

“She was running down the street screaming, ‘Help!’ ” said witness Jose Mendez, 56, a local building super.

Before cops and Clarke could reach the woman, she had briefly ducked into a small noodle shop at 13B Eldridge St. as she ran away, witnesses said.

After coming out again, she traveled another half-block again before she stopped for Clarke and the officers.

“She was barefoot and went into the restaurant and then ran back out,” Mendez said. “There was blood on the window. They cleaned it up right away. It was pretty weird.”